A book is resting on a horizontal table so that the only two forces acting on it

Question

A book is resting on a horizontal table so that the only two forces acting on it are Earth's gravity FG and normal reaction of the table n. The result n = -FG follows

(check all that apply) from an application of Newton's 2nd law. from an application of Newton's 3rd law. because the normal force always balances the force of gravity. because normal force is defined as gravity force in most books.
(check all that apply) from an application of Newton's 2nd law. from an application of Newton's 3rd law. because the normal force always balances the force of gravity. because normal force is defined as gravity force in most books. from an application of Newton's 2nd law. from an application of Newton's 3rd law. because the normal force always balances the force of gravity. because normal force is defined as gravity force in most books. from an application of Newton's 2nd law. from an application of Newton's 3rd law. because the normal force always balances the force of gravity. because normal force is defined as gravity force in most books.

Explanation / Answer

forms an application of newton's third law. because normal force always balances force of gravity

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